Write San Marino 1956 article: the law that did not name cannabis

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+# San Marino 1956 Law No. 7 article (new, 360 words)
+
+- Wrote `articles/san-marino-law-no-7-1956.md`: 23 Feb 1956 law on the
+  1931 convention (3-8 years, cannabis unnamed) → 1973 US survey finding →
+  1988 Law No. 32 fix (cannabis table, art. 6 annulment, Captains Regent
+  decree mechanism; 1981 decree tables as the leaned-on machinery) →
+  1997 repeal → 2016 istanza d'Arengo → Sativex free (MS, neuropathic
+  pain). Framed around the unnamed drug, deferring 1988 detail to the
+  concurrent `san-marino-narcotics-additions-1988.md` (linked, untouched).
+- Sources: Wikipedia San Marino (survey quote, 2016 initiative);
+  E/NL.1988/42 (cannabis list, art. 6 annulment, decree mechanism —
+  read in the SM batch); Law 139/1997 (repeal locator from the checked
+  1988 entry context).
+- No changes.yaml edits; chain sm 0 flagged; history:test 41/41,
+  answers:test 69/69, build 4478 pages, rendered page verified.
+
+## Caution for future SM work
+
+- The article filename for the 1988 law is
+  `san-marino-narcotics-additions-1988.md` (concurrent) vs the entry id
+  `san-marino-narcotics-law-1988` (ours). Links must use the article
+  filename — verified rendered.